Avalanche Thyristor TL271-250-7 (TA271-250-7) – Stud thyristor, 294A 700V
Stud Avalanche Thyristor TL271-250-7AS ENERGITM is general purpose stud thyristor, also known as TA271-250-7. Average forward current ITAV – 294 ampere, repetitive peak forward and reverse blocking voltage VDRM/VRRM – 700V. Stud thyristors are designed to convert and control DC and AC currents. "Air-cooled heatsinks O series for stud devices" for thyristor cooling are also available to order.
Air heat sinks are used to cool the avalanche thyristors. To provide reliable thermal and electrical contact with the heatsink a tightening torque Md must be observed during assembly. For better heat dissipation of thyristor during assembly, heat conducting paste is used (this is a recommendation and is not a prerequisite for installation).
The polarity of the thyristor is determined by the icon on the case. The base of the thyristor is the Anode, the flexible power lead is the Cathode, the flexible wire exiting the base of the power lead is the auxiliary cathode, the flexible wire exiting the case is the control electrode (Gate). The technical specifications, part numbering guide, polarity, dimensions and recommended coolers for thyristors are listed below.
Air and water heat sinks are used to cool the thyristors. To provide reliable thermal and electrical contact with the heatsink a tightening torque Md must be observed during assembly. For better heat dissipation of thyristor during assembly, heat conducting paste is used.
Avalanche Thyristors AS ENERGITM have the following features: low static and dynamic losses, wide values of VDRM/VRRM, extensive experience of using the devices in various industries, range of voltages from 100 to 9000 V and amperages from 10 to 15000 A, high resistance to thermal and electric cycling, natural or forced air cooling.
The technical specifications and parameters of avalanche thyristor TL271-250-7 (TA271-250-7), datasheet PDF, outline drawing and dimensions are listed below.
Our company provides a quality guarantee for avalanche thyristors of 2 years from the date of purchase. When supplying thyristors, if necessary, we provide technical passport and certificate of conformity.
The final price for stud thyristors depends on the voltage class, quantity, delivery terms, manufacturer, country of origin and form of payment.
General specifications of Stud (Flexible Lead) Avalanche Thyristor TL271-250-7 (TA271-250-7) (294A 700V):
|Stud Avalanche Thyristor specifications||TL271-250-7
|Average forward current (Case temperature)||ITAV (TC)||294 A (100ºC)|
|Repetitive pulsed closed state voltage; repetitive pulsed reverse voltage||VDRM/VRRM||700 V|
|Surge on-state current||ITSM||8.0 kA|
|On-state threshold voltage||VT(TO)||1.045 V|
|Peak on-state voltage||VTM||1.6 V|
|Peak on-state current||ITM||785 A|
|On-state slope resistance||rT||0.767 mΩ|
|Repetitive peak off-state||IDRM||35 mA|
|Critical rate of rise of off-state voltage||(dVD/dt)cr||320-1000 V/µs|
|Critical rate of rise of on-state current||(diT/dt)cr||800 A/µs|
|Gate trigger direct current||IGT||250 mA|
|Gate trigger direct voltage||VGT||2.5 V|
|Temperature of p-n junction||Tvj max||140 ºC|
|Shock reverse power dissipation||PRSM (tp)||16 kW (100ms)|
|Thermal resistance, junction to case||Rth(j-c)||0.085 ºC/W|
|Recommended heatsinks||Heatsinks||O181, O281, OM105|
Part Numbering Guide for Stud Avalanche Thyristor:
|TL||–||Thyristor Avalanche (alternative marking "TA") AS ENERGITM|
|271||–||Thyristor type (stud type, flexible lead).|
|250||–||Average current in open state IT(AV), Amp.|
|7||–||Voltage class VRRM / 100 (Nominal voltage – 700 V).|
High Power Semiconductors AS ENERGITM
Our company is engaged in the manufacturer and sale of wide range of power semiconductors (power thyristors, modules, rectifier diodes, avalanche, rotor and welding diodes, triacs etc.) currents up to 15000A and voltages to 9000V, and air and water heatsinks to them.
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Heat sinks for power stud thyristors:
Heat sinks (radiators) are used for cooling of power semiconductor devices in stud design.
Heat sinks of coolers are made of aluminum radiator profiles and do not require additional protective coating when used in various climatic conditions.
See for more information about heatsinks: "Air-cooled heatsinks for stud devices".
Installation recommendations for power stud mount thyristors:
The reliability of heat transfer and electrical contact between the mating surfaces of the thyristor and the cooler over the entire temperature range is ensured by appropriate torque.
Before assembly you should perform visual inspection (1) contact surfaces for mechanical damages and wipe (2), soaked with alcohol (toluene, gasoline, acetone).
To improve the parameters of heat transfer it is recommended to lubricate (3) a thin layer of silicone thermal conductive paste before the assembly, which is not a mandatory condition for installation.
After installation, the fasteners (nuts and washers) must be additionally secured against corrosion.
Tips and recommendations for power thyristors:
The power thyristors should not be operated for long periods of time at their limit load for all parameters. In this case, the safety factor is determined by the required degree of reliability of the device.
Replace a failed power thyristor with a thyristor that matches the parameters of the one being replaced.
Supercooling must be provided when operating in an environment with an elevated ambient temperature.
Periodic cleaning of power thyristors and coolers to remove dust and contaminants is recommended to ensure proper heat dissipation.
Inductive current dividers (often twisted toroidal wire) should be used to equalize currents between power thyristors connected in parallel. The most popular connection methods are closed circuit, common coil circuit, or power thyristor. The efficiency of current dividers in this case is determined by the cross section of the magnetic wire.
Prevention of voltage unbalance when power thyristors are connected in series is achieved by using shunt resistors connected in parallel with each thyristor. Voltage equalization in transient conditions is provided by connecting capacitors in parallel to each thyristor.
It is strictly forbidden to touch power thyristors under high voltage during operation.
Photo of power thyristors TA171, TA271, TA371:
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Our company provides a quality guarantee for products of 2 years.
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Our products range includes rectifier diodes, phase control thyristors in disc and stud design, avalanche diodes and thyristors, fast switching, high frequency thyristors, fast recovery, welding and rotor diodes, triacs, bridge rectifiers, power modules (thyristor, diode, thyristor-diode, IGBT), and air and water heatsinks to them.
Power diodes and thyristors are produced for currents from 10A to 15000A, voltage range from 100V to 9000V.
Power diode and thyristor modules are produced from 25A and up to 1250A, voltage range 400V - 4400V.
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